211572421540 has 24 divisors (see below), whose sum is σ = 448615702080. Its totient is φ = 83807327328.

The previous prime is 211572421499. The next prime is 211572421553. The reversal of 211572421540 is 45124275112.

It is a junction number, because it is equal to n+sod(n) for n = 211572421496 and 211572421505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51350470 + ... + 51354589.

It is an arithmetic number, because the mean of its divisors is an integer number (18692320920).

Almost surely, 2^211572421540 is an apocalyptic number.

211572421540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211572421540 is an abundant number, since it is smaller than the sum of its proper divisors (237043280540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211572421540 is a wasteful number, since it uses less digits than its factorization.

211572421540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102705171 (or 102705169 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 34.

Adding to 211572421540 its reverse (45124275112), we get a palindrome (256696696652).

The spelling of 211572421540 in words is "two hundred eleven billion, five hundred seventy-two million, four hundred twenty-one thousand, five hundred forty".